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Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 109: Quantum dots and wires: Quantum communication and quantum information science

HL 109.1: Talk

Friday, March 20, 2015, 11:15–11:30, ER 164

Optical Tomography of Electron Spins in (In,Ga)As Quantum Dots — •Janina Schindler1, Steffen Varwig1, Alexandre René1, Sophia Economou2, Alex Greilich1, Dmitri Yakovlev1,3, Dirk Reuter4, Andreas Wieck4, Thomas Reinecke2, and Manfred Bayer11Experimentelle Physik II, TU Dortmund, D-44221 Dortmund, Germany — 2Naval Research Laboratory, Washington D.C. 20375, USA — 3Ioffe Physical Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia — 4Angewandte Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany

Electron spins in quantum dots are considered as a promising candidate for implementing quantum bits in semiconductors. As already has been shown in preceding experiments, their control, manipulation and read-out can be achieved purely optical. For the implementation of quantum gates, two interacting qubits are required. There has already been evidence for interaction between two qubits, which are realized by electron spin ensembles of self-assembled (In,Ga)As quantum dots. To scrutinise the interaction between these ensembles, we perform optical time-resolved pump-probe ellipticity measurements on the spin polarisation. More precisely, we study the time evolution of a spin component along the magnetic field based on optically induced spin rotations to read out all spin-vector components.

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